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/*
* Register cache access API - flat caching support
*
* Copyright 2012 Wolfson Microelectronics plc
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include "internal.h"
static inline unsigned int regcache_flat_get_index(const struct regmap *map,
unsigned int reg)
{
return regcache_get_index_by_order(map, reg);
}
static int regcache_flat_init(struct regmap *map)
{
int i;
unsigned int *cache;
if (!map || map->reg_stride_order < 0 || !map->max_register)
return -EINVAL;
map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
+ 1, sizeof(unsigned int), GFP_KERNEL);
if (!map->cache)
return -ENOMEM;
cache = map->cache;
for (i = 0; i < map->num_reg_defaults; i++)
cache[regcache_flat_get_index(map, map->reg_defaults[i].reg)] =
map->reg_defaults[i].def;
return 0;
}
static int regcache_flat_exit(struct regmap *map)
{
kfree(map->cache);
map->cache = NULL;
return 0;
}
static int regcache_flat_read(struct regmap *map,
unsigned int reg, unsigned int *value)
{
unsigned int *cache = map->cache;
*value = cache[regcache_flat_get_index(map, reg)];
return 0;
}
static int regcache_flat_write(struct regmap *map, unsigned int reg,
unsigned int value)
{
unsigned int *cache = map->cache;
cache[regcache_flat_get_index(map, reg)] = value;
return 0;
}
struct regcache_ops regcache_flat_ops = {
.type = REGCACHE_FLAT,
.name = "flat",
.init = regcache_flat_init,
.exit = regcache_flat_exit,
.read = regcache_flat_read,
.write = regcache_flat_write,
};
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